In the seventh season, Troi takes the bridge officer's examination and is promoted to the rank of commander, but continues as counselor.

Although Deanna Troi has little exposure to Earth culture, she attended Starfleet Academy from 2355 to 2359, as well as the University of Betazed, and earned an advanced degree in psychology.

Deanna Troi serves as the ship's counselor aboard the Starfleet starships USS Enterprise (NCC-1701-D) and Enterprise-E under the command of Captain Jean-Luc Picard.

In Star Trek: Nemesis, Troi leaves the Enterprise with her new husband William Riker, who has just been promoted to captain of the USS Titan.

[2] Early in the series, Troi finds herself working with a former lover, the newly assigned first officer to USS Enterprise, Commander William Riker.

In the season-five episode, "Violations", the Enterprise encounters an alien species who are telepathic and specialise in being able to bring back lost memories.

Troi is an avid connoisseur of chocolate, a fact that is significant in multiple episodes, including one in which she tells Commander Riker how to properly enjoy eating it.

In the episode "Remember Me", Beverly Crusher briefly describes Troi to Captain Picard to jog his memory and mentions that she "loves chocolate".

[4] She was just about to return home, in debt and jobless, when she received the phone call alerting her that she had the role of Deanna Troi.

Series creator Gene Roddenberry initially intended Troi to be "eye candy" - beautiful, sexy, and not very bright.

[6] Prior to filming, Sirtis was told to lose 5 lb (2.3 kg), but thought to herself that she had to drop even more, and was often wearing plunging necklines and form-fitting dresses.

After six years, the producers decided to drop the "sexy and brainless" Troi and make her a stronger character, represented by changing her outfit to a standard crew uniform: I was thrilled when I got my regulation Starfleet uniform... it covered up my cleavage and I got all my brains back, because when you have cleavage, you can't have brains in Hollywood...

[13] In 2020, Tom's Guide recommended the Star Trek: The Next Generation episodes "Ménage à Troi", "Face of the Enemy" and "Thine Own Self" as having some of the best moments for this character.

[14] In 2020, SyFy Wire was very positive about her performance in the Star Trek: Picard episode "Nepenthe", explaining that "It features Deanna Troi at her very best, with Marina Sirtis at the height of her powers.

Troi appears in the Star Trek: Picard season 1 episode "Nepenthe", set twenty years after Nemesis where she is married to Riker and they have two children, Thad (deceased) and Kestra.

When Jean-Luc Picard and his android companion Soji visit the Rikers' home, Deanna and her husband welcome them with open arms.

She is later revealed to have been abducted by the antagonists of the season, and is reunited with Riker, who had fallen into an existential crisis after Thad's death and needed to temporarily separate from her to get outside help from Picard.

Troi appears in the first-season finale of the animated Star Trek: Lower Decks, set a year after the events of Nemesis.